user
Task: Write an algorithm to open a door using a secret knock.


assistant
Algorithm for Opening a Door with a Secret Knock:
1. Knock the door the specified number of times and listen for the sound from inside.
2. If the sound is not heard after the specified number of knocks, repeat the sequence. 
3. After the correct sequence is heard, open the door. 
4. If the sound is heard but the door does not open, enter a different sequence and repeat step two.